It is not just libertarians who are concerned about the restrictions caused by America's latest copyright law. Edward Felten, a professor at Princeton University, argues that the “freedom to tinker”—the right to understand, repair and modify one's own equipment— is crucial to innovation, and as valuable to society as the freedom of speech0

Network security: Keeping networks secure from intruders is becoming one of the hottest bits of the computer business. As companies begin to realise how vulnerable they are, intrusion-detection firms are honing a new set of security tools that mimic the body's immune system0